Preamp Tubes

T-nutsT-nuts
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    T-nuts
    I am looking into replacing the preamp tubes in my 6505. Now I just did the Power Tubes and they needed to be biased but what do you have to do for Preamp tubes? Also, any suggestions on what kind?
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    xnatex
    xnatex wrote

    try a Tung-sol in V-1(the far right one). try a 12AT7in V-4(far left). and JJs in the other 3 spots. that works great for me in my 5150 block letter

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      T-nuts
      T-nuts wrote

      Okay.
      I forgot to mention it was a 6505+/5150II.
      I'm unsure as to whether that changes anything.

      Also, are they just directly swappable?
      Like just pull them out and stick new ones in and away you go?

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        Deadpulse
        Deadpulse wrote

        yes, just pop them in and start playing

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          LordCliffton
          LordCliffton wrote

          Yes, the bias adjustment has "minimal adjustment settings so you don't get yourself into too much trouble" playing with it by ear instead of using a multimeter...

          You CAN adjust the bias some but IF it was ever adjusted properly(using the multimeter) before & then left there, AND you are using the same type/brand tubes that was in it before, then you are pretty much ready to go-pop in the new tubes & go.

          I wouldn't worry about it too much. Like I said only 'minimal adjustment' is possible with the bias knob.
          peace

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